On Thu, 1 Apr 2021, Anthony Walter via lazarus wrote:
I noticed a recent discussion touching on this problem posted by Bo Berglund on November 20, 2020 to this same mailing list. Andreas Schneider replied in that thread, 'Pasting basically asks the application that "copied" it to get the content. If that app is gone in the meantime, there's nothing to paste anymore.' Also, Colin Western replied this is how Linux applications work, 'the data is kept with the source program, so goes when the program closes'. I disagree. I've tested several Gtk2 applications, including older versions of Gimp and Geany. Both these programs have clipboard copy functions and the data on the clipboard from those applications my tests show their clipboard data persists after they have been closed. So it would seem that Gtk2 the clipboard works correctly and handles persisting data after an application has exited. I stepped through the LCL source and it looks like the clipboard code is using some Gtk clipboard functions, and not using X windows functions, thereby introducing a possible problem, but I am unsure if the LCL is using the Gtk clipboard correctly. That is, the LCL might be using some Gtk clipboard functions which seem to work well, but exhibit the problematic behaviour I've described.
I think the programs you tested use some extra functions, because as these 2 persons already said: under X11, the selection is owned by the program, not by X11. See e.g. https://www.uninformativ.de/blog/postings/2017-04-02/0/POSTING-en.html https://wiki.ubuntu.com/ClipboardPersistence for an explanation. Basically: if you don't communicate with a persistent clipboard app, then nothing will happen to persist your selection. Michael. -- _______________________________________________ lazarus mailing list lazarus@lists.lazarus-ide.org https://lists.lazarus-ide.org/listinfo/lazarus
