Shares sapped by tech problems and Brexit snags

LONDON (Reuters) - World stock markets struggled on Wednesday, as hopes faded that a Brexit deal would be wrapped by next week and a profit warning from Texas Instruments pulled down technology shares.It was hard to pick which was weighing on sentiment more in European trading. The pound was yanked down to $1.2850 from $1.30 after UK lawmakers put the brakes on the government's Brexit plans again on Tuesday.Meanwhile, Europe's tech sector fell as much as 1.4% as STMicroelectronics , Dialog..