I've seen this semi-regularly too, and I had it just yesterday.
The earliest bug report I can find is from September (for alpha.9561) It's very difficult to reproduce on demand, but I think here is definitely a bug somewhere
On 11 March 2015 at 11:50, Igor me@igorkozlov.me wrote:
A friend of mine started getting some weird bug not so long ago.
Within the Find dialog text boxes at some point stop rendering carets and stop responding visually to keyboard input. But every time you click the “Find” button content within those text boxes magically updates. The only way to fix this is to restart TextMate. Closing/reopening Find dialog doesn’t help.
He made a video that shows this behavior https://www.dropbox.com/s/0hkhkrcqtzyi6ho/tm.search.bug.mov?dl=0
OS X 10.9 TextMate version 2.0-beta.6.8
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