Wayland: typed text not drawn in name prompts again (New Calculation/Project/Study), and Builder pane resize freezes #339

Found 2026-10-15 on GNOME Wayland (Debian 13). ECCE runs through XWayland (GDK_BACKEND=x11). Build: wip/test-912. Regression of #311, which was confirmed fixed in 9.1.0.

Name prompts. The typed text arrives (the name appears in the tree after Enter) but is not drawn in the field while typing. Affected: New Calculation, New Project, New GROMACS MD Study.

Diagnosis:

• ECCE already sets GTK_IM_MODULE=gtk-im-context-simple, but XMODIFIERS=@im=ibus is inherited from the session.
• With XMODIFIERS= ecce, the prompt draws via File > New, but still not via the tree's right-click menu.
• So there are two causes:
  1. The launcher must clear XMODIFIERS as well as set the simple IM.
  2. The context-menu path opens the dialog while the popup menu, or a busy cursor or window disabler, still holds input.

Builder pane resize. Resizing the Build pane in the docked column leaves the Builder stuck: resize cursor, no clicks. gdb shows the main loop idle, i.e. a drag that is never released. It happens on native Wayland and, after more resizing, under XWayland too. Under XWayland the sizing is also wrong: the sash above Build cannot be grabbed, and the sash below moves space between Selection and Open structures, not into Build.

Workaround until fixed: start with XMODIFIERS= ecce, create via File > New, and do not resize the Build pane.

Being fixed on wip/wayland-input. Related: #311, #332, #120.