annotation-window: use its color for the close button

Vanadiae requested to merge (removed):annotation-close-button-color into master

see commit message for details.


the EV_STOCK_CLOSE icon is now used in only one place in the code. I'll provide a MR to remove it entirely.

to do:

  • make the close button round like in all application windows
  • darken the background of the button on press (like every button do) and lighten on hover
  • don't use the annotation's color for the window close icon (cross) but use the most appropriate one between black #000000 or white #FFFFFF

(reminder for myself: for an other MR, remove the custom made resize buttons and just use GTK window resize feature)

Edited by Vanadiae

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