commit ee8a336cbc407e7fb587e2c155fee8c7a5d76e1e
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Tue Feb 26 16:37:41 2019 +0100

    Update screen as needed when preferences are changed
    
    This commit removes the adhoc code in GuiPrefs and moves it to LyXRC,
    so that it triggers in every preference change.
    
    The code has also been updated to trigger on more variables, e.g.
    font_*_foundry.
    
    Note that the actual function that are called have not been changed
    (addPreviews and LFUN_SCREEN_FONT_UPDATE), although there are doubts
    that they behave as needed (see FIXMEs).
    
    Fixes bug #11498.
    
    (cherry picked from commit 954531f247adee029c12713634a81717f87a2bcf)
---
 src/LyXRC.cpp                        |   25 ++++++++++++++-
 src/frontends/qt4/GuiApplication.cpp |    3 ++
 src/frontends/qt4/GuiPrefs.cpp       |   58 +++-------------------------------
 src/frontends/qt4/GuiPrefs.h         |    9 -----
 status.23x                           |    6 ++-
 5 files changed, 36 insertions(+), 65 deletions(-)

diff --git a/src/LyXRC.cpp b/src/LyXRC.cpp
index 71f184d..67530bd 100644
--- a/src/LyXRC.cpp
+++ b/src/LyXRC.cpp
@@ -23,6 +23,8 @@
 #include "Converter.h"
 #include "FontEnums.h"
 #include "Format.h"
+#include "FuncCode.h"
+#include "FuncRequest.h"
 #include "Lexer.h"
 #include "LyX.h"
 #include "Mover.h"
@@ -3003,6 +3005,14 @@ void actOnUpdatedPrefs(LyXRC const & lyxrc_orig, LyXRC 
const & lyxrc_new)
                }
                // fall through
        case LyXRC::RC_PREVIEW:
+               if (lyxrc_orig.preview != lyxrc_new.preview) {
+                       // Update all previews of all documents.
+                       /* FIXME: this can be very expensive. It would be 
cheaper
+                        * to kill all existing previews and update visible
+                        * previews.*/
+                       theBufferList().updatePreviews();
+               }
+               // fall through
        case LyXRC::RC_PREVIEW_HASHED_LABELS:
        case LyXRC::RC_PREVIEW_SCALE_FACTOR:
        case LyXRC::RC_PRINTLANDSCAPEFLAG:
@@ -3011,6 +3021,7 @@ void actOnUpdatedPrefs(LyXRC const & lyxrc_orig, LyXRC 
const & lyxrc_new)
        case LyXRC::RC_SAVE_COMPRESSED:
        case LyXRC::RC_SAVE_ORIGIN:
        case LyXRC::RC_SCREEN_DPI:
+
        case LyXRC::RC_SCREEN_FONT_ROMAN:
        case LyXRC::RC_SCREEN_FONT_ROMAN_FOUNDRY:
        case LyXRC::RC_SCREEN_FONT_SANS:
@@ -3019,8 +3030,20 @@ void actOnUpdatedPrefs(LyXRC const & lyxrc_orig, LyXRC 
const & lyxrc_new)
        case LyXRC::RC_SCREEN_FONT_SIZES:
        case LyXRC::RC_SCREEN_FONT_TYPEWRITER:
        case LyXRC::RC_SCREEN_FONT_TYPEWRITER_FOUNDRY:
-       case LyXRC::RC_GEOMETRY_SESSION:
        case LyXRC::RC_SCREEN_ZOOM:
+               if (lyxrc_orig.roman_font_name != lyxrc_new.roman_font_name
+               || lyxrc_orig.sans_font_name != lyxrc_new.sans_font_name
+               || lyxrc_orig.typewriter_font_name != 
lyxrc_new.typewriter_font_name
+               || lyxrc_orig.roman_font_foundry != lyxrc_new.roman_font_foundry
+               || lyxrc_orig.sans_font_foundry != lyxrc_new.sans_font_foundry
+               || lyxrc_orig.use_scalable_fonts != lyxrc_new.use_scalable_fonts
+               || lyxrc_orig.font_sizes != lyxrc_new.font_sizes
+               || lyxrc_orig.typewriter_font_foundry != 
lyxrc_new.typewriter_font_foundry
+               || lyxrc_orig.defaultZoom != lyxrc_new.defaultZoom) {
+               dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
+       }
+
+       case LyXRC::RC_GEOMETRY_SESSION:
        case LyXRC::RC_SERVERPIPE:
        case LyXRC::RC_SET_COLOR:
        case LyXRC::RC_SHOW_BANNER:
diff --git a/src/frontends/qt4/GuiApplication.cpp 
b/src/frontends/qt4/GuiApplication.cpp
index 3c6e137..3d88764 100644
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -1632,6 +1632,9 @@ void GuiApplication::dispatch(FuncRequest const & cmd, 
DispatchResult & dr)
 
        case LFUN_SCREEN_FONT_UPDATE: {
                // handle the screen font changes.
+               /* FIXME: this only updates the current document, whereas all
+                * documents should see their metrics updated.
+                */
                d->font_loader_.update();
                dr.screenUpdate(Update::Force | Update::FitCursor);
                break;
diff --git a/src/frontends/qt4/GuiPrefs.cpp b/src/frontends/qt4/GuiPrefs.cpp
index 58810df..ae0986e 100644
--- a/src/frontends/qt4/GuiPrefs.cpp
+++ b/src/frontends/qt4/GuiPrefs.cpp
@@ -1101,19 +1101,6 @@ void PrefScreenFonts::applyRC(LyXRC & rc) const
        rc.font_sizes[FONT_SIZE_HUGE] = widgetToDoubleStr(screenHugeED);
        rc.font_sizes[FONT_SIZE_HUGER] = widgetToDoubleStr(screenHugerED);
        rc.use_pixmap_cache = pixmapCacheCB->isChecked();
-
-       if (rc.font_sizes != oldrc.font_sizes
-               || rc.roman_font_name != oldrc.roman_font_name
-               || rc.sans_font_name != oldrc.sans_font_name
-               || rc.typewriter_font_name != oldrc.typewriter_font_name
-               || rc.defaultZoom != oldrc.defaultZoom) {
-               // The global QPixmapCache is used in GuiPainter to cache text
-               // painting so we must reset it in case any of the above
-               // parameter is changed.
-               QPixmapCache::clear();
-               guiApp->fontLoader().update();
-               form_->updateScreenFonts();
-       }
 }
 
 
@@ -1447,16 +1434,10 @@ void PrefDisplay::applyRC(LyXRC & rc) const
                        rc.preview = LyXRC::PREVIEW_OFF;
                        break;
                case 1:
-                       if (rc.preview != LyXRC::PREVIEW_NO_MATH) {
-                               rc.preview = LyXRC::PREVIEW_NO_MATH;
-                               form_->updatePreviews();
-                       }
+                       rc.preview = LyXRC::PREVIEW_NO_MATH;
                        break;
                case 2:
-                       if (rc.preview != LyXRC::PREVIEW_ON) {
-                               rc.preview = LyXRC::PREVIEW_ON;
-                               form_->updatePreviews();
-                       }
+                       rc.preview = LyXRC::PREVIEW_ON;
                        break;
        }
 
@@ -3537,8 +3518,7 @@ void PrefIdentity::updateRC(LyXRC const & rc)
 /////////////////////////////////////////////////////////////////////
 
 GuiPreferences::GuiPreferences(GuiView & lv)
-       : GuiDialog(lv, "prefs", qt_("Preferences")), 
update_screen_font_(false),
-         update_previews_(false)
+       : GuiDialog(lv, "prefs", qt_("Preferences"))
 {
        setupUi(this);
 
@@ -3647,8 +3627,6 @@ bool GuiPreferences::initialiseParams(string const &)
        converters_.update(formats_);
        movers_ = theMovers();
        colors_.clear();
-       update_screen_font_ = false;
-       update_previews_ = false;
 
        updateRC(rc_);
        // Make sure that the bc is in the INITIAL state
@@ -3682,24 +3660,10 @@ void GuiPreferences::dispatchParams()
 
        theMovers() = movers_;
 
-       vector<string>::const_iterator it = colors_.begin();
-       vector<string>::const_iterator const end = colors_.end();
-       for (; it != end; ++it)
-               dispatch(FuncRequest(LFUN_SET_COLOR, *it));
+       for (string const & color : colors_)
+               dispatch(FuncRequest(LFUN_SET_COLOR, color));
        colors_.clear();
 
-       if (update_screen_font_) {
-               dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
-               // resets flag in case second apply in same dialog
-               update_screen_font_ = false;
-       }
-
-        if (update_previews_) {
-               // resets flag in case second apply in same dialog
-               theBufferList().updatePreviews();
-               update_previews_ = false;
-       }
-
        // Save permanently
        if (!tempSaveCB->isChecked())
                dispatch(FuncRequest(LFUN_PREFERENCES_SAVE));
@@ -3712,18 +3676,6 @@ void GuiPreferences::setColor(ColorCode col, QString 
const & hex)
 }
 
 
-void GuiPreferences::updateScreenFonts()
-{
-       update_screen_font_ = true;
-}
-
-
-void GuiPreferences::updatePreviews()
-{
-       update_previews_ = true;
-}
-
-
 QString GuiPreferences::browsebind(QString const & file) const
 {
        return browseLibFile("bind", file, "bind", qt_("Choose bind file"),
diff --git a/src/frontends/qt4/GuiPrefs.h b/src/frontends/qt4/GuiPrefs.h
index b36f2e6..4f877a1 100644
--- a/src/frontends/qt4/GuiPrefs.h
+++ b/src/frontends/qt4/GuiPrefs.h
@@ -98,12 +98,6 @@ public:
        /// set a color
        void setColor(ColorCode col, QString const & hex);
 
-       /// update the screen fonts after change
-       void updateScreenFonts();
-
-       /// update the previews after change
-       void updatePreviews();
-
        LyXRC & rc() { return rc_; }
        Converters & converters() { return converters_; }
        Formats & formats() { return formats_; }
@@ -124,9 +118,6 @@ private:
 
        /// A list of colors to be dispatched
        std::vector<std::string> colors_;
-
-       bool update_screen_font_;
-       bool update_previews_;
 };
 
 
diff --git a/status.23x b/status.23x
index e21ebf9..5243604 100644
--- a/status.23x
+++ b/status.23x
@@ -116,10 +116,10 @@ What's new
 
 - Fix some display problems in the Text Properties dialog (bug 11385).
 
-- Accept/reject changes inside selection only if there are changes (bug 
+- Accept/reject changes inside selection only if there are changes (bug
   10338).
 
-- Fix missing TOC update (and related bugs) when setting default master (bug 
+- Fix missing TOC update (and related bugs) when setting default master (bug
   11422).
 
 - Properly update bibliography information (with bibliography environment)
@@ -154,6 +154,8 @@ What's new
 
 - Fix many drawing glitches in the IPA icons.
 
+- Fix crash when disabling math preview (bug 11498).
+
 
 
 * INTERNALS

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