https://bugs.kde.org/show_bug.cgi?id=457981

            Bug ID: 457981
           Summary: Transform Tool - Perspective, after moving one corner
                    point, other corner points are also moved.
           Product: krita
           Version: 5.1.0-RC1
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Tools/Transform
          Assignee: krita-bugs-n...@kde.org
          Reporter: 1012468...@qq.com
  Target Milestone: ---

Created attachment 151367
  --> https://bugs.kde.org/attachment.cgi?id=151367&action=edit
The kra file used to reproduce the bug.

SUMMARY
Transform Tool - Perspective, after moving one corner point, other corner
points are also moved.
I don’t understand why what didn’t move moved.
This makes it impossible to quickly align them using the Transform Tool -
Perspective.
For example, paste the portrait to the portrait frame on the wall through the
transformation tool - perspective.

STEPS TO REPRODUCE
1. Open kra.
2. Switch to Transform Tool - Perspective.
3. Press and hold the lower right corner.
4. Approach to the upper left corner, then move away.
(Multiple repetitions will be obvious.)

OBSERVED RESULT
Transform Tool - Perspective, after moving one corner point, other corner
points are also moved.

EXPECTED RESULT
The moving corner point moves, and the other corner points remain stationary.

SOFTWARE/OS VERSIONS
Krita

 Version: 5.1.0-RC1
 Installation type: installer / portable package
 Hidpi: true

Qt

  Version (compiled): 5.12.12
  Version (loaded): 5.12.12

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.19042
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

Locale

  Languages: en_US, en_US
  C locale: C
  QLocale current: en
  QLocale system: zh
  QTextCodec for locale: UTF-8
  Process ACP: 65001 (UTF-8)
  System locale default ACP: 936   (ANSI/OEM - 简体中文 GBK)

OpenGL Info

  Vendor:  "Google Inc. (NVIDIA)" 
  Renderer:  "ANGLE (NVIDIA, NVIDIA GeForce GTX 970 Direct3D11 vs_5_0 ps_5_0,
D3D11-30.0.15.1179)" 
  Version:  "OpenGL ES 3.0.0 (ANGLE 2.1.0 git hash:
f2280c0c5f93+krita_qt5.12.12)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0 git hash:
f2280c0c5f93+krita_qt5.12.12)" 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
  Current format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 
  supportsBufferMapping: true 
  supportsBufferInvalidation: false 
  forceDisableTextureBuffers: true 
  Extensions: 
     "GL_EXT_debug_label" 
     "GL_OVR_multiview" 
     "GL_EXT_disjoint_timer_query" 
     "GL_OES_compressed_ETC2_sRGB8_alpha8_texture" 
     "GL_OES_texture_border_clamp" 
     "GL_NV_EGL_stream_consumer_external" 
     "GL_NV_fence" 
     "GL_EXT_occlusion_query_boolean" 
     "GL_EXT_texture_rg" 
     "GL_EXT_float_blend" 
     "GL_EXT_multi_draw_indirect" 
     "GL_OES_EGL_image_external" 
     "GL_ANGLE_texture_compression_dxt5" 
     "GL_ANGLE_framebuffer_blit" 
     "GL_ANGLE_lossy_etc_decode" 
     "GL_CHROMIUM_lose_context" 
     "GL_EXT_shader_texture_lod" 
     "GL_OES_packed_depth_stencil" 
     "" 
     "GL_CHROMIUM_bind_uniform_location" 
     "GL_EXT_discard_framebuffer" 
     "GL_EXT_clip_control" 
     "GL_OES_element_index_uint" 
     "GL_NV_framebuffer_blit" 
     "GL_ANGLE_texture_multisample" 
     "GL_KHR_debug" 
     "GL_KHR_parallel_shader_compile" 
     "GL_OES_texture_stencil8" 
     "GL_EXT_debug_marker" 
     "GL_EXT_sRGB" 
     "GL_ANGLE_pack_reverse_row_order" 
     "GL_ANGLE_framebuffer_multisample" 
     "GL_EXT_instanced_arrays" 
     "GL_OES_texture_half_float" 
     "GL_EXT_read_format_bgra" 
     "GL_OES_compressed_EAC_RG11_signed_texture" 
     "GL_OVR_multiview2" 
     "GL_OES_mapbuffer" 
     "GL_ANGLE_multi_draw" 
     "GL_AMD_performance_monitor" 
     "GL_OES_get_program_binary" 
     "GL_EXT_map_buffer_range" 
     "GL_EXT_texture_filter_anisotropic" 
     "GL_CHROMIUM_copy_texture" 
     "GL_ANGLE_base_vertex_base_instance" 
     "GL_OES_rgb8_rgba8" 
     "GL_EXT_texture_compression_bptc" 
     "GL_ANGLE_get_tex_level_parameter" 
     "GL_EXT_texture_norm16" 
     "GL_ANGLE_request_extension" 
     "GL_OES_compressed_ETC2_punchthroughA_RGBA8_texture" 
     "GL_NV_pack_subimage" 
     "GL_EXT_color_buffer_float" 
     "GL_EXT_unpack_subimage" 
     "GL_OES_compressed_ETC2_RGB8_texture" 
     "GL_OES_compressed_ETC2_sRGB8_texture" 
     "GL_OES_draw_elements_base_vertex" 
     "GL_ANGLE_base_vertex_base_instance_shader_builtin" 
     "GL_OES_EGL_image_external_essl3" 
     "GL_ANGLE_get_serialized_context_string" 
     "GL_EXT_EGL_image_external_wrap_modes" 
     "GL_EXT_texture_compression_rgtc" 
     "GL_EXT_texture_type_2_10_10_10_REV" 
     "GL_CHROMIUM_bind_generates_resource" 
     "GL_EXT_draw_elements_base_vertex" 
     "GL_OES_depth24" 
     "GL_OES_surfaceless_context" 
     "GL_ANGLE_program_cache_control" 
     "GL_ANGLE_copy_texture_3d" 
     "GL_CHROMIUM_copy_compressed_texture" 
     "GL_OES_vertex_array_object" 
     "GL_EXT_frag_depth" 
     "GL_NV_pixel_buffer_object" 
     "GL_EXT_multisampled_render_to_texture" 
     "GL_ANGLE_depth_texture" 
     "GL_EXT_draw_buffers" 
     "GL_ANGLE_instanced_arrays" 
     "GL_OES_compressed_EAC_R11_unsigned_texture" 
     "GL_EXT_blend_func_extended" 
     "GL_ANGLE_client_arrays" 
     "GL_OES_texture_float_linear" 
     "GL_OES_compressed_EAC_RG11_unsigned_texture" 
     "GL_OES_texture_float" 
     "GL_OES_texture_half_float_linear" 
     "GL_OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture" 
     "GL_CHROMIUM_sync_query" 
     "GL_OES_compressed_ETC2_RGBA8_texture" 
     "GL_ANGLE_robust_client_memory" 
     "GL_OES_texture_npot" 
     "GL_ANGLE_memory_size" 
     "GL_ANGLE_texture_compression_dxt3" 
     "GL_EXT_blend_minmax" 
     "GL_OES_draw_buffers_indexed" 
     "GL_EXT_texture_compression_s3tc_srgb" 
     "GL_OES_standard_derivatives" 
     "GL_EXT_robustness" 
     "GL_OES_EGL_image" 
     "GL_ANGLE_multiview_multisample" 
     "GL_ANGLE_texture_usage" 
     "GL_OES_fbo_render_mipmap" 
     "GL_EXT_color_buffer_half_float" 
     "GL_EXT_texture_format_BGRA8888" 
     "GL_WEBGL_video_texture" 
     "GL_EXT_texture_compression_dxt1" 
     "GL_EXT_draw_buffers_indexed" 
     "GL_OES_compressed_EAC_R11_signed_texture" 
     "GL_ANGLE_provoking_vertex" 
     "GL_ANGLE_translated_shader_source" 
     "GL_EXT_texture_storage" 
     "GL_OES_depth32" 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 

useBufferInvalidation (config option): false


Hardware Information

  GPU Acceleration: auto
  Memory: 32693 Mb
  Number of Cores: 16
  Swap Location: C:/Users/xi/AppData/Local/Temp
  Built for: sse2
  Base instruction set: sse2
  Supported instruction sets: fma3+avx2 avx2 fma3+avx avx fma4 fma3+sse4.2
sse4.2 sse4.1 ssse3 sse3 sse2 

Current Settings

  Current Swap Location: C:/Users/xi/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 200
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Disable Vector Optimizations: false
  Disable AVX Optimizations: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 420
  Use Backup Files: true
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Display Information
Number of screens: 2
        Screen: 0
                Name: \\.\DISPLAY1
                Depth: 32
                Scale: 1
                Physical DPI117.596
                Logical DPI96
                Physical Size: 553, 311
                Position: 0, 0
                Resolution in pixels: 2560x1440
                Manufacturer: 
                Model: 
                Refresh Rate: 59
        Screen: 1
                Name: \\.\DISPLAY2
                Depth: 32
                Scale: 1
                Physical DPI141.951
                Logical DPI96
                Physical Size: 344, 193
                Position: 638, 1440
                Resolution in pixels: 1920x1080
                Manufacturer: 
                Model: 
                Refresh Rate: 60


---------------------
================================================================================
SESSION: 17 Aug 2022 13:43:53 +0800. Executing C:\Program Files\Krita
(x64)\bin\krita.exe

Krita Version: 5.1.0-RC1, Qt version compiled: 5.12.12, loaded: 5.12.12.
Process ID: 2828
-- -- -- -- -- -- -- --
17 Aug 2022 13:43:53 +0800: Style: fusion. Available styles: windowsvista,
Windows, Fusion
17 Aug 2022 13:43:54 +0800: Creating database from scratch (database didn't
exist, new schema version: 0.0.17).
17 Aug 2022 13:44:07 +0800: Non-store package - creating updater
17 Aug 2022 13:45:56 +0800: Importing application/x-krita to
application/x-krita. Location: C:/Users/xi/Desktop/bug.kra. Real location:
C:/Users/xi/Desktop/bug.kra. Batchmode: 0
17 Aug 2022 13:45:57 +0800: Loaded image from application/x-krita. Size: 6000 *
6000 pixels, 4.16665 dpi. Color model: 8 位整数/通道 RGB/透明度
(sRGB-elle-V2-srgbtrc.icc). Layers: 3
17 Aug 2022 13:51:27 +0800: CLOSING SESSION
================================================================================
SESSION: 17 Aug 2022 13:51:29 +0800. Executing C:\Program Files\Krita
(x64)\bin\krita.exe

Krita Version: 5.1.0-RC1, Qt version compiled: 5.12.12, loaded: 5.12.12.
Process ID: 2312
-- -- -- -- -- -- -- --
17 Aug 2022 13:51:29 +0800: Style: fusion. Available styles: windowsvista,
Windows, Fusion
17 Aug 2022 13:51:30 +0800: Database is up to date. Version: 0.0.17, created by
Krita 5.1.0-RC1, at 周三 8月 17 13:43:54 2022
17 Aug 2022 13:51:32 +0800: Non-store package - creating updater
17 Aug 2022 13:53:09 +0800: Importing application/x-krita to
application/x-krita. Location: C:\Users\xi\Desktop\bug.kra. Real location:
C:\Users\xi\Desktop\bug.kra. Batchmode: 0
17 Aug 2022 13:53:10 +0800: Loaded image from application/x-krita. Size: 6000 *
6000 pixels, 4.16665 dpi. Color model: 8-bit integer/channel RGB/Alpha
(sRGB-elle-V2-srgbtrc.icc). Layers: 3
17 Aug 2022 13:53:40 +0800: Importing application/x-krita to
application/x-krita. Location: C:\Users\xi\Desktop\bug.kra. Real location:
C:\Users\xi\Desktop\bug.kra. Batchmode: 0
17 Aug 2022 13:53:40 +0800: Loaded image from application/x-krita. Size: 6000 *
6000 pixels, 4.16665 dpi. Color model: 8-bit integer/channel RGB/Alpha
(sRGB-elle-V2-srgbtrc.icc). Layers: 3

---------------------

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