[xiphos-source] [crosswire/xiphos] 9b1e66: Fix expander triangle (#1299)

[LAfricain]

  Branch: refs/heads/master
  Home:   https://github.com/crosswire/xiphos
  Commit: 9b1e66a547d03b15716a4f547cddb835b4d93df2
      https://github.com/crosswire/xiphos/commit/9b1e66a547d03b15716a4f547cddb835b4d93df2
  Author: L'Africain <fr.cyrille at tiberiade.be>
  Date:   2026-03-22 (Sun, 22 Mar 2026)

  Changed paths:
    M src/gtk/sidebar.c

  Log Message:
  -----------
  Fix expander triangle (#1299)

* mod_mgr: add Left/Right arrow keys to expand/collapse module groups

* fix(sidebar): prevent expander triangle click from being cancelled

The button_release handler was unconditionally toggling expand/collapse
on every click, immediately reversing what GTK had already done on
button_press when clicking the expander triangle.

Fix by detecting whether the click occurred on the expander zone using
the click coordinates and GTK's expander-size style property. Clicks
on the expander triangle are now left to GTK, while clicks on the text
label still trigger expand/collapse as before.

Fixes #912

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Co-authored-by: lafricain79 <lafricain79 at gmail.com>



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