Merge from origin/emacs-29

Merge from origin/emacs-29

7e1012765c4 Fix libwebp check for some webp installations
c2ca009da4c Avoid potential infloop
34c14430e9d Don't misindent 'else:' after 'if re.match:' in Python
8a2a554192a * Make sure `default-directory' exists before spawning pr...
1862e7eb7ef Fix sed expression in install-etc make target
c8ec0017cb9 Avoid using bash in the emacsclient desktop file
a588937094f Fix documentation of the 'line-height' text property
971ded31c4f Add 'declare' specs to with- and without-restriction