Some classes provide a \bibliographystyle, so we must not output any
\bibliographystyle if none is set in the TeX file.
Fixes: #10673
(cherry picked from commit ed331bedd6f7c412cbcf552c58da5d7b62846339)
Add a `cancel' boolean to macroModeClose() that just removes all trace
of what has been entered instead of finalizing it.
When entering a macro in mathed, let LFUN_ESCAPE invoke
macroModeClose(true). The new semantics of LFUN_ESCAPE in mathed is
thus to abort the input of a macro name.
Fixes bug #9251.
(cherry picked from commit 9296344b9a26191a2092d175a51e357ecc35145d)
As of v. 1.7.7, chktex has four exit values. Only consider the program
failed with EXIT_FAILURE (1). This is backwards compatible to chktex
up to v. 1.7.5 and later patched versions included in TeXLive, where
there was the distinction EXIT_FAILURE (program failed) and EXIT_SUCCESS
(program successfully run, with or without something to report).
Note that ChkTeX v. 1.7.5 and 1.7.6 vanilla (as included in MikTeX) also
returned EXITE_FAILURE if ChkTeX found something to report.
We do not, and never did, support this case.
Fixes: #9989 (after ChkTeX 1.7.7. is released).
(cherry picked from commit 0d806799aaef65b12a9b75e8c49c2613c68d5ac2)
