Tk Source Code

text-9.2.47 fails sometimes

For me on Win 7 it's almost always.

==== text-9.2.47 TextWidgetCmd procedure, "count" option FAILED
==== Contents of test case:

    for {set i 1} {$i < 25} {incr i} {
        .t insert end "Line $i\n"
    }
    .t tag configure hidden -elide true
    .t tag add hidden 5.7 11.0
    update
    set y1 [lindex [.t yview] 1]
    .t count -displaylines 5.0 11.0
    set y2 [lindex [.t yview] 1]
    .t count -displaylines 5.0 12.0
    set y3 [lindex [.t yview] 1]
    list [expr {$y1 == $y2}] [expr {$y1 == $y3}]

---- Result was:
0 0
---- Result should have been (exact matching):
1 1
==== text-9.2.47 FAILED

Fixed in core-8-5-branch and trunk.

Root cause is that at the time .t yview is called, the asynchronous calculation of the line heights is not finished.

This can be worked around by calling .t count -update -ypixels 1.0 end before .t yview

See also [1566949].