ui: show historical balances whenever possible #392

hledger-ui now tries to show historical balances always, including
when (to limit transactions on the register screen) a report start date
is specified. This means that:

- the accounts screen balances are not disturbed by a start date

- the register screen is now a little better at showing the running
  historical balance. It's still not very good at it; some filter
  queries will cause it to fall back to showing the running total of
  visible transactions. But it's no longer disturbed by Z (nonzero mode)
  or a cur: query term.

hledger-ui/Hledger/UI/AccountsScreen.hs

@@ -68,10 +68,7 @@ asInit d reset ui@UIState{
                        mexactmatch  = findIndex ((a ==)                      . asItemAccountName) displayitems
                        mprefixmatch = findIndex ((a `isAccountNamePrefixOf`) . asItemAccountName) displayitems
     uopts' = uopts{cliopts_=copts{reportopts_=ropts'}}
-    ropts' = ropts {
-      -- XXX balanceReport doesn't respect this yet
-      balancetype_=HistoricalBalance
-      }
+    ropts' = ropts{accountlistmode_=if flat_ ropts then ALFlat else ALTree}
 
     q = queryFromOpts d ropts
 
@@ -82,7 +79,7 @@ asInit d reset ui@UIState{
         valuedate = fromMaybe d $ queryEndDate False q
 
     -- run the report
-    (items,_total) = convert $ balanceReport ropts' q j
+    (items,_total) = convert $ singleBalanceReport ropts' q j
 
     -- pre-render the list items
     displayitem (fullacct, shortacct, indent, bal) =

hledger-ui/Hledger/UI/Main.hs

@@ -84,7 +84,9 @@ runBrickUi uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}} j = do
             -- show items with zero amount by default, unlike the CLI
             empty_=True,
             -- always disable boring account name eliding, unlike the CLI, for a more regular tree
-            no_elide_=True
+            no_elide_=True,
+            -- always show historical balances, regardless of report start date
+            balancetype_=HistoricalBalance
             }
          }
       }