Bug fix #1939

Combining panorama scene and Sequencer effect on scene (like glow) crashed.

Found two other issues;

- on click in sequencer, the image output window didn't redraw correct, but
  only when a render window was opened. Caused by missing 'activate' call
- added a pause in dragging-frame loop to make it idle friendly

source/blender/render/intern/source/initrender.c

@@ -1193,6 +1193,9 @@ void RE_initrender(struct View3D *ogl_render_view3d)
 	if(R.r.scemode & R_DOSEQ) {
 		R.rectx= R.r.xsch;
 		R.recty= R.r.ysch;
+		if(R.r.mode & R_PANORAMA) {
+			R.rectx*= R.r.xparts;
+		}
 		
 		if(R.rectot) MEM_freeN(R.rectot);
 		R.rectot= (unsigned int *)MEM_callocN(sizeof(int)*R.rectx*R.recty, "rectot");

source/blender/src/drawseq.c

@@ -468,7 +468,7 @@ void set_special_seq_update(int val)
 }
 
 
-static void draw_image_seq(void)
+static void draw_image_seq(ScrArea *sa)
 {
 	SpaceSeq *sseq;
 	StripElem *se;
@@ -478,8 +478,6 @@ static void draw_image_seq(void)
 	glClearColor(0.0, 0.0, 0.0, 0.0);
 	glClear(GL_COLOR_BUFFER_BIT);
 
-	curarea->win_swap= WIN_BACK_OK;
-
 	ibuf= (ImBuf *)give_ibuf_seq( (G.scene->r.cfra));
 
 	if(special_seq_update) {
@@ -494,17 +492,18 @@ static void draw_image_seq(void)
 	}
 	if(ibuf==0 || ibuf->rect==0) return;
 
-	sseq= curarea->spacedata.first;
+	sseq= sa->spacedata.first;
 	if(sseq==0) return;
 
 	/* calc location */
-	x1= curarea->winrct.xmin+(curarea->winx-sseq->zoom*ibuf->x)/2;
-	y1= curarea->winrct.ymin+(curarea->winy-sseq->zoom*ibuf->y)/2;
+	x1= sa->winrct.xmin+(sa->winx-sseq->zoom*ibuf->x)/2;
+	y1= sa->winrct.ymin+(sa->winy-sseq->zoom*ibuf->y)/2;
 
-	rectwrite_part(curarea->winrct.xmin, curarea->winrct.ymin,
-				curarea->winrct.xmax, curarea->winrct.ymax,
+	rectwrite_part(sa->winrct.xmin, sa->winrct.ymin,
+				sa->winrct.xmax, sa->winrct.ymax,
 				x1, y1, ibuf->x, ibuf->y, (float)sseq->zoom,(float)sseq->zoom, ibuf->rect);
 
+	sa->win_swap= WIN_BACK_OK;
 }
 
 static void draw_extra_seqinfo(void)
@@ -777,7 +776,8 @@ void drawseqspace(ScrArea *sa, void *spacedata)
 
 	sseq= curarea->spacedata.first;
 	if(sseq->mainb==1) {
-		draw_image_seq();
+		draw_image_seq(curarea);
+		curarea->win_swap= WIN_BACK_OK;
 		return;
 	}
 

source/blender/src/sequence.c

@@ -64,11 +64,13 @@
 #include "BKE_scene.h"
 #include "BKE_ipo.h"
 
-#include "BIF_screen.h"
-#include "BIF_interface.h"
-#include "BIF_toolbox.h"
 #include "BSE_filesel.h"
+#include "BIF_interface.h"
 #include "BSE_headerbuttons.h"
+#include "BIF_screen.h"
+#include "BIF_space.h"
+#include "BIF_toolbox.h"
+
 #include "BSE_sequence.h"
 
 #include "blendef.h"
@@ -1953,6 +1955,7 @@ void do_build_seqar_cfra(ListBase *seqbase, Sequence ***seqar, int cfra)
 
 						RE_initrender(NULL);
 						if (!G.background) {
+							mainwindow_make_active();
 							if(R.r.mode & R_FIELDS) update_for_newframe_muted();
 							R.flag= 0;
 

source/blender/src/space.c

@@ -3126,6 +3126,7 @@ static void winqreadseqspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 						force_draw(0);
 						update_for_newframe();	/* for audio scrubbing */						
 					}
+					else PIL_sleep_ms(30);
 				
 				} while(get_mbut() & mousebut);