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Overview
Comment:Tests and fix for [scale ... -variable].
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Timelines: family | ancestors | descendants | both | bug-5d991b822e
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SHA3-256: c1dd2ab02ea97b8023b9854b1bcb5f386f5c00caf1bae854be13055f04e5c01c
User & Date: dgp 2019-05-15 17:30:35
Context
2019-05-15
18:05
Tests and fix for similar issues in [menu]. Closed-Leaf check-in: c69b1cc4 user: dgp tags: bug-5d991b822e
17:30
Tests and fix for [scale ... -variable]. check-in: c1dd2ab0 user: dgp tags: bug-5d991b822e
17:20
Tests and fix for [message ... -textvariable]. check-in: da24fd68 user: dgp tags: bug-5d991b822e
Changes
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Changes to generic/tkScale.c.

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    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
	if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {






















	    Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ScaleVarProc, clientData);
	    scalePtr->flags |= NEVER_SET;
	    TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
	}
	return NULL;






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    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {


        if (!Tcl_InterpDeleted(interp) && scalePtr->varNamePtr) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        Tcl_GetString(scalePtr->varNamePtr),
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        ScaleVarProc, probe);
                if (probe == (ClientData)scalePtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /* 
                 * We were able to fetch the unset trace for our
                 * varNamePtr, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ScaleVarProc, clientData);
	    scalePtr->flags |= NEVER_SET;
	    TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
	}
	return NULL;

Changes to tests/scale.test.

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} -body {
    pack [scale .s]
    # non-regression test for bug [55b95f578a] - shall just not crash
    .s configure -from -6.8e99 -to 8.8e99
} -cleanup {
    destroy .s
} -result {}



























option clear

# cleanup
cleanupTests
return






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} -body {
    pack [scale .s]
    # non-regression test for bug [55b95f578a] - shall just not crash
    .s configure -from -6.8e99 -to 8.8e99
} -cleanup {
    destroy .s
} -result {}

test scale-22.1 {Bug [5d991b822e]} {
    # Want this not to crash
    set var INIT
    scale .b -variable var
    trace add variable var unset {apply {args {
        .b configure -variable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
} {}
test scale-22.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    scale .b -variable var
    trace add variable var unset {apply {args {
        .b configure -variable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}

option clear

# cleanup
cleanupTests
return