gitk: Add the equivalent of diff --color-words
Use the newly added 'diff --word-diff=porcelain' to teach gitk a color-words mode, with two different modes analogous to the --word-diff=plain and --word-diff=color settings. These are selected by a dropdown box. As an extra twist, automatically enable this word-diff support when the user mentions a word-diff related option on the command line. These options were previously ignored because they would break diff parsing. Both of these features are only enabled if we have a version of git that supports --word-diff=porcelain, meaning at least 1.7.2. Signed-off-by: NThomas Rast <trast@student.ethz.ch> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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