[PATCH] comctl32/progress: Handle min == max case in PBM_STEPIT.

[Nikolay Sivov]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46485
Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>
---
 dlls/comctl32/progress.c       | 31 ++++++++++++++++---------------
 dlls/comctl32/tests/progress.c | 26 +++++++++++++++++++++-----
 2 files changed, 37 insertions(+), 20 deletions(-)

diff --git a/dlls/comctl32/progress.c b/dlls/comctl32/progress.c
index 28d9fd2fd3..268bdac5da 100644
--- a/dlls/comctl32/progress.c
+++ b/dlls/comctl32/progress.c
@@ -652,23 +652,24 @@ static LRESULT WINAPI ProgressWindowProc(HWND hwnd, UINT message,
 
     case PBM_STEPIT:
     {
-	INT oldVal;
-        oldVal = infoPtr->CurVal;
-        infoPtr->CurVal += infoPtr->Step;
-        if (infoPtr->CurVal > infoPtr->MaxVal)
-        {
-            infoPtr->CurVal = (infoPtr->CurVal - infoPtr->MinVal) % (infoPtr->MaxVal - infoPtr->MinVal) + infoPtr->MinVal;
-        }
-        if (infoPtr->CurVal < infoPtr->MinVal)
+        int oldVal = infoPtr->CurVal;
+
+        if (infoPtr->MinVal != infoPtr->MaxVal)
         {
-            infoPtr->CurVal = (infoPtr->CurVal - infoPtr->MinVal) % (infoPtr->MaxVal - infoPtr->MinVal) + infoPtr->MaxVal;
+            infoPtr->CurVal += infoPtr->Step;
+            if (infoPtr->CurVal > infoPtr->MaxVal)
+                infoPtr->CurVal = (infoPtr->CurVal - infoPtr->MinVal) % (infoPtr->MaxVal - infoPtr->MinVal) + infoPtr->MinVal;
+            if (infoPtr->CurVal < infoPtr->MinVal)
+                infoPtr->CurVal = (infoPtr->CurVal - infoPtr->MinVal) % (infoPtr->MaxVal - infoPtr->MinVal) + infoPtr->MaxVal;
+
+            if (oldVal != infoPtr->CurVal)
+            {
+                TRACE("PBM_STEPIT: current pos changed from %d to %d\n", oldVal, infoPtr->CurVal);
+                PROGRESS_Invalidate( infoPtr, oldVal, infoPtr->CurVal );
+                UpdateWindow( infoPtr->Self );
+            }
         }
-        if(oldVal != infoPtr->CurVal)
-	{
-	    TRACE("PBM_STEPIT: current pos changed from %d to %d\n", oldVal, infoPtr->CurVal);
-            PROGRESS_Invalidate( infoPtr, oldVal, infoPtr->CurVal );
-            UpdateWindow( infoPtr->Self );
-	}
+
         return oldVal;
     }
 
diff --git a/dlls/comctl32/tests/progress.c b/dlls/comctl32/tests/progress.c
index 497cb47d3c..91ea6eec2a 100644
--- a/dlls/comctl32/tests/progress.c
+++ b/dlls/comctl32/tests/progress.c
@@ -254,6 +254,13 @@ static void test_PBM_STEPIT(void)
         { 3, 15,  5 },
         { 3, 15, -5 },
         { 3, 15, 50 },
+        { -15, 15,  5 },
+        { -3, -2, -5 },
+        { 0, 0, 1 },
+        { 5, 5, 1 },
+        { 0, 0, -1 },
+        { 5, 5, -1 },
+        { 10, 5, 2 },
     };
     HWND progress;
     int i, j;
@@ -261,6 +268,7 @@ static void test_PBM_STEPIT(void)
     for (i = 0; i < ARRAY_SIZE(stepit_tests); i++)
     {
         struct stepit_test *test = &stepit_tests[i];
+        PBRANGE range;
         LRESULT ret;
 
         progress = create_progress(0);
@@ -268,6 +276,9 @@ static void test_PBM_STEPIT(void)
         ret = SendMessageA(progress, PBM_SETRANGE32, test->min, test->max);
         ok(ret != 0, "Unexpected return value.\n");
 
+        SendMessageA(progress, PBM_GETRANGE, 0, (LPARAM)&range);
+        ok(range.iLow == test->min && range.iHigh == test->max, "Unexpected range.\n");
+
         SendMessageA(progress, PBM_SETPOS, test->min, 0);
         SendMessageA(progress, PBM_SETSTEP, test->step, 0);
 
@@ -277,15 +288,20 @@ static void test_PBM_STEPIT(void)
             int current;
 
             pos += test->step;
-            if (pos > test->max)
-                pos = (pos - test->min) % (test->max - test->min) + test->min;
-            if (pos < test->min)
-                pos = (pos - test->min) % (test->max - test->min) + test->max;
+            if (test->min != test->max)
+            {
+                if (pos > test->max)
+                    pos = (pos - test->min) % (test->max - test->min) + test->min;
+                if (pos < test->min)
+                    pos = (pos - test->min) % (test->max - test->min) + test->max;
+            }
+            else
+                pos = test->min;
 
             SendMessageA(progress, PBM_STEPIT, 0, 0);
 
             current = SendMessageA(progress, PBM_GETPOS, 0, 0);
-            ok(current == pos, "Unexpected position %d, expected %d.\n", current, pos);
+            ok(current == pos, "%u: unexpected position %d, expected %d.\n", i, current, pos);
         }
 
         DestroyWindow(progress);
-- 
2.20.1