add project subtraction amounts.

svelte-ui/src/forms/ProjectForm.svelte

@@ -26,6 +26,7 @@
     createdTime: "",
     tasks: [],
     favorite: false,
+    subtractAmount: 0,
   }
   let verb = "Add";
   if (md.name === "project.edit" || md.name === "project.delete") {
@@ -42,6 +43,7 @@
   let statusTag = project.statusTag || "";
   let icon = project.icon;
   let favorite = project.favorite;
+  let subtractAmount = project.subtractAmount;
   let error = null;
   let loading = false;
 
@@ -57,6 +59,7 @@
         startTime: ( startTime == "" ) ? null : new Date(startTime),
         endTime: ( endTime == "" ) ? null : new Date(endTime),
         statusTag: statusTag !== "" ? statusTag : null,
+        subtractAmount: Math.min(subtractAmount, 0),
 
         name, description, icon, favorite,
       }).then(() => {
@@ -85,6 +88,7 @@
         active: statusTag === "",
         statusTag: statusTag || null,
         clearStatusTag: statusTag === "",
+        subtractAmount: subtractAmount,
 
         name, description, icon, favorite,
       }).then(() => {
@@ -119,6 +123,8 @@
     {#if endTime != ""}
       <label for="endTime">Start time</label>
       <StartTimeSelect disabled={deletion} bind:value={startTime} />
+      <label for="subtractAmount">Subtract progress</label>
+      <input disabled={deletion} name="subtractAmount" type="number" bind:value={subtractAmount} />  
     {/if}
     <label for="statusTag">Status</label>
     <StatusTagSelect disabled={deletion} isProject bind:value={statusTag} />